Morse Runner is a Windows-based contest simulator developed by Alex Shovkoplyas, VE3NEA. Using Wineskin, it has been successfully and seamlessly run under OSX, and made available here for download. Sure, you could use Wineskin to do this yourself (and save me some bandwidth), or you can pull the ready-made dmg from here.
Running Catalina? Go to 'Download' to read the latest (and grab a box of tissues)

Users can alter factory parameters, such as disabling the auto start-stop system, activating needle sweep on startup, adapting new battery registration codes, or adjusting service intervals.
Beyond just skipping license checks, the loader's primary purpose is to enable communication between the diagnostic software and your computer's operating system. It acts as a bridge, translating data from your car's electronic control units (ECUs) into a language the software on your PC can understand, and vice versa.
The Kolimer Loader (with version 9.2 being a long-standing "top" or stable release) is a specialized application that sits between the VCDS software and the clone cable. vcds 2530 kolimer loader 92 top
If you ignore the warnings and still search for this tool, watch for these red flags:
The phrase represents a dangerous fantasy: cheap, unlimited diagnostic power without paying. In reality, it is a trap for the unwary. The handful of users who claim it works are either lucky, running it in an isolated virtual machine, or unaware of the silent malware on their PC. Users can alter factory parameters, such as disabling
Prevents the software from communicating with licensing servers if you accidentally leave your Wi-Fi on.
Here’s a brief write-up explaining what this refers to and why it’s significant from a technical and ethical standpoint: The Kolimer Loader (with version 9
Essential for routine garage work. The system handles electronic parking brake (EPB) retraction for rear brake pad swaps, diesel particulate filter (DPF) forced regeneration, and throttle body alignments.
: Viewing real-time data for "measuring blocks," such as turbo boost pressure, fuel trims, or battery health, which is essential for performance tuning.
Confirmed working on: El Capitan, Mavericks, Sierra, High Sierra, & Mojave
MANY reports that it DOES NOT work on Catalina. It is very unlikely that it will work under Catalina in the near future, as it would require some pretty hefty development on Wine (they're working on it). The only other option I see is for some nice macOS developer to take the original code (it's open source!) and re-write it to run natively on 64bit macOS (go ask any developer, this is a lot of work). Since Xcode is now free if you're running Catalina, I'm happy to give it a try... when I can afford to buy a system that can run Catalina :)
If you have questions or comments about using this application under OSX, please email them to ki4stu k4iz at arrl dot net.